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Lenovo VIBE Z2 (Android 4.4.4) Settings crashes

I have a Lenovo VIBE Z2 smartphone. After some time of using I have faced these problems:
->When clicking on System Update the Settings app crashes
->Hospot turns off spontaneously
I cannot update my Android because the System Update doesn't work.
I have tried wiping the cache of Settings, but nothings changed.
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Lenovo Z2
Android 4.4.4
Kernel: 3.10.28+
Build: VIBEUI_V2.0_1448_5.5.1_ST_Z2
Hardware version: H203
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Thanks!